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/*    Copyright (C) 2011  Nicola Corti

    This program is free software: you can redistribute it and/or modify
    it under the terms of the GNU General Public License as published by
    the Free Software Foundation, either version 3 of the License, or
    (at your option) any later version.

    This program is distributed in the hope that it will be useful,
    but WITHOUT ANY WARRANTY; without even the implied warranty of
    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
    GNU General Public License for more details.

    You should have received a copy of the GNU General Public License
    along with this program.  If not, see <http://www.gnu.org/licenses/>.

                 For further information, Nicola Corti - <cortin [at] cli.di.unipi.it>
*/


#ifndef __HEAP_H
#define __HEAP_H


typedef struct heap_elem{

        unsigned int label;
        
        double dist;
        
} heap_elem_t;

typedef struct heap_array{

        unsigned int heap_size;
        
        heap_elem_t * array;
        
} heap_array_t;



int is_empty(heap_array_t * coda);


void enqueue(heap_array_t * coda, unsigned int elem, double dist);


int decrease_key(heap_array_t * coda, unsigned int elem, double new_dist);


int dequeue(heap_array_t * coda);

#endif